计算机工程与应用 ›› 2011, Vol. 47 ›› Issue (16): 239-241.

• 工程与应用 • 上一篇    下一篇

网络化控制系统的时变采样及反馈调度策略

刘 琦1,孔 峰1,张雪林2   

  1. 1.广西工学院 计算机工程系,广西 柳州 545006
    2.广西大学 电气工程学院,南宁 530004
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2011-06-01 发布日期:2011-06-01

Strategy of time-varying sampling and feedback scheduling for networked control systems

LIU Qi1,KONG Feng1,ZHANG Xuelin2   

  1. 1.Department of Computer Engineering,Guangxi University of Technology,Liuzhou,Guangxi 545006,China
    2.College of Electrical Engineering,Guangxi University,Nanning 530004,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2011-06-01 Published:2011-06-01

摘要: 多处理器网络化控制系统中,信息传输的时延是使控制性能变差的主要原因之一。改进型混合调度算法通过在一个基本采样周期内的多次采样,形成时变的采样周期,缩减信息传输的截止期,可使信息传输的时延大为减少;同时构建网络化控制系统的反馈调度模型,通过调节基本采样周期,及时调度信息传输,能使网络的空闲时间始终保持在一个合理状态。仿真结果表明,网络利用率有所提高,网络化控制系统的动态性能有所改善。

关键词: 网络化控制系统, 调度算法, 时变采样, 反馈调度模型

Abstract: In multi-processor networked control systems,time-delay of information-transmission is one of the main causes for bad control performance.Improved mixed traffic scheduling algorithm can cut much time-delay by sampling several times in a basic sampling-period and completing time-varying sampling-periods to shorten deadline of information-transmission.And by regulating the basic sampling-period of control system,feedback scheduling model for networked control system can schedule instantly information-transmission and always keep reasonable leisure-time.As a result,time-delay for information in the network is decreased,and a rate of utilization for network is raised.According to the results from simulation experiment,the rate of utilization for network and dynamic performance of networked control systems are all improved.

Key words: networked control system, scheduling algorithm, time-varying sampling, feedback scheduling model